What should I do? And answer them what?
It's not the right place to discuss such issue in my opinion. If your broker is regulated then you should contact the regulatory instance.
I doubt a log file is a "irrevocable proof" from a legal point of view, anything can be written in a log.
My broker cannot go in the opposite direction. I want to know if this is legal.
So.. where is the right place if not with Metatrader technicians and specialists??
Log files not editable, how is that ? A file is always editable. Anyway.
I already answered to your question, contact the regulator(s).